Family shield anarchist's leader in comfort as planned (4,2,4)
I believe the answer is:
coat of arms
'family shield' is the definition.
(shield-shaped family emblem)
'anarchist's leader in comfort as planned' is the wordplay.
'leader' suggests taking the first letters.
'in' is an insertion indicator.
'planned' is an anagram indicator.
The initial letter of 'anarchists' is 'a'.
'comfort'+'as'='comfortas'
'comfortas' is an anagram of 'cotofarms'.
'a' going into 'cotofarms' is 'COAT OF ARMS'.
(Other definitions for coat of arms that I've seen before include "Badge" , "Family insignia" , "Sign of a family" , "Armorial bearings" , "Official device" .)